Are you having trouble in your prayer life? Do you feel as though your heart is hardened soil as you pray? Sing the psalms! Wilhelmus a’Brakel gave this encouragement to his readers over 300 years ago when he wrote:
Singing will move a heart which frequently remains unmoved during prayer. It can be that while singing the tears will drip upon the book. Have you not frequently experienced this? Have not you been stirred up by hearing the singing of others? Others will therefore also be stirred up by your singing.
The Papists in France knew this, and therefore they strictly forbade the singing of psalms and meted out cruel punishment for this—even prior to massacring the church.
Therefore, no longer be silent, but lift up your voices—in spite of the devil and all the enemies of God—to the honor and glory of your God, as this has done you too much good already (and still does) than that you would refrain from thanking the Lord with songs of praise. You must furthermore do so in order that you might stir up others to serve the Lord with gladness. It will then become manifest to all natural men that godliness is a joyous rather than a grievous life, and they will become desirous for this as well.
And if you sing, sing with understanding, with a fervent desire, conscious of the presence of the Lord (and thus reverently), with a modest demeanor, and with both inner and external attentiveness, so that it may all be becoming before the Lord and to the edification of others who surround us.
–Christians Reasonable Service, volume 4, p. 36-37.
You can purchase your four volume set here.